Solve for u
u=7
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56-3u-5u=0
Subtract 5u from both sides.
56-8u=0
Combine -3u and -5u to get -8u.
-8u=-56
Subtract 56 from both sides. Anything subtracted from zero gives its negation.
u=\frac{-56}{-8}
Divide both sides by -8.
u=7
Divide -56 by -8 to get 7.
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Matrix
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Limits
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